1. Wireless Communication Center, Faculty of Electrical Engineering, Universiti Teknologi Malaysia, Johor Bahru 81310, Malaysia
2. Faculti Kejuruteraan Elektrik dan Elektronik, Univeristi Tun Hussein Onn Malaysia, Parit Raja 86400, Malaysia
3. Department of Electrical Engineering, Polytechnique Montreal, Montreal, QC H3T 1J4, Canada